Nurikabe


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Nurikabe is a logic puzzle with a bit complicated rules and challenging solutions.

The rules are not so simple. :)
You have a grid of squares Some cells of the grid start containing numbers. The goal is to determine whether each of the cells of the grid is "black" or "white" (Islands in the Stream calls these "water" and "land" respectively). The black cells form "the nurikabe" (Islands in the Stream calls it "the stream"): they must all be orthogonally contiguous (form a single polyomino), number-free, and contain no 2x2 or larger solid rectangles (Islands in the Stream calls such illegal blocks "pools"). The white cells form "islands" (which is where Islands in the Stream got its name): each number n must be part of an n-omino composed only of white cells. All white cells must belong to exactly one island; islands must have exactly one numbered cell. Solvers will typically shade in cells they have deduced to be black and dot (non-numbered) cells deduced to be white.
Left click on a square to make it black. Right click to mark with dot. Click and drag to mark more than one square.

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Nurikabe


5x5 Easy Nurikabe | 5x5 Hard Nurikabe | 7x7 Easy Nurikabe | 7x7 Hard Nurikabe | 10x10 Easy Nurikabe | 10x10 Hard Nurikabe | 12x12 Easy Nurikabe | 12x12 Hard Nurikabe | 15x15 Easy Nurikabe | 15x15 Hard Nurikabe | 20x20 Easy Nurikabe

This Month
1. asdfhavcjklcjkl 00:02.37
2. Min._.下(KR)
97
00:02.46
3. JZE
81
00:02.75
4. RelaxedCockatoo
65
00:02.90
5. 222champ 00:03.53
6. CP2023
4
00:03.55
7. turkhuu
19
00:03.61
8. Jovess 00:03.79
9. YouTwo#5542
111
00:03.87
10. HackMan
105
00:04.15
11. Rhododendron
131
00:04.27
12. hfd hsfd
74
00:04.45
13. inshiel 00:04.50
14. Pngaea
18
00:05.04
15. Harry_Canyon
126
00:05.13
16. arp82 00:05.22
17. wam3988 00:05.29
18. potent_electron
6
00:05.54
19. jeszon
58
00:05.61
20. abcdegf
33
00:05.78
This Week
1. asdfhavcjklcjkl 00:02.37
2. JZE
81
00:02.75
3. 222champ 00:03.53
4. inshiel 00:04.50
5. turkhuu
19
00:04.86
6. potent_electron
6
00:05.54
7. jeszon
58
00:05.61
8. GregInBcn 00:06.46
9. HackMan
105
00:06.71
10. Tristal
47
00:07.62
11. Tuffi
24
00:08.58
12. ChiefOsceola 00:09.61
13. FunAcroFly
67
00:09.81
14. shangdou
22
00:10.81
15. TJ11235
8
00:11.57
16. Dorice
242
00:12.68
17. giovannipu
13
00:13.50
18. PDX2021
69
00:13.77
19. CLAVDIVS
55
00:19.47
20. chris8765 00:25.40
Today
1. HackMan
105
00:06.71
2. Tuffi
24
00:09.15
3. potent_electron
6
00:12.50
4. PDX2021
69
00:13.77
5. CLAVDIVS
55
00:19.47
6.--- empty -----:--
7.--- empty -----:--
8.--- empty -----:--
9.--- empty -----:--
10.--- empty -----:--
11.--- empty -----:--
12.--- empty -----:--
13.--- empty -----:--
14.--- empty -----:--
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18.--- empty -----:--
19.--- empty -----:--
20.--- empty -----:--
MO3
1. vowels
216
00:01.35
2. Douglas Shamlin Jr.
692
00:01.45
3. nabi
92
00:01.64
4. haramey
230
00:01.70
5. jaybrainer
235
00:01.75
6. BingBongBob
108
00:01.76
7. sfumato
166
00:01.78
8. bearn
206
00:01.91
9. numbrr
297
00:02.12
10. jai22933
23
00:02.19
AO5
1. vowels
216
00:01.43
2. Douglas Shamlin Jr.
692
00:01.47
3. nabi
92
00:01.50
4. haramey
230
00:01.78
5. jaybrainer
235
00:01.79
6. BingBongBob
108
00:01.88
7. sfumato
166
00:01.89
8. bearn
206
00:01.93
9. jai22933
23
00:02.29
10. numbrr
297
00:02.33
AO12
1. vowels
216
00:01.70
2. Douglas Shamlin Jr.
692
00:01.71
3. nabi
92
00:01.75
4. haramey
230
00:02.06
5. jaybrainer
235
00:02.14
6. bearn
206
00:02.24
7. BingBongBob
108
00:02.27
8. sfumato
166
00:02.29
9. numbrr
297
00:02.56
10. Min._.下(KR)
97
00:02.58
Robots / programmatic solversinfo  
1.cheyette00:00.119
2.Charlie Li
61
00:00.208
3.nbjohnson00:00.407

* MO3 - Mean of 3. The average of 3 consecutive times.
AO5 - Average of 5. The average of 5 consecutive times ignoring the highest and the lowest.
AO12 - Average of 12. The average of 12 consecutive times ignoring the highest and the lowest.
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2025-06-30 21:50:17

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